.window
  %table.backtrace
    -# Group lines into internal / external so we can toggle the external backtrace
    -# Includes a margin of x lines that are not toggled.
    - em = 4 # (external backtrace margin)
    - grouped_lines(lines).each do |in_app, line_group|
      - if !in_app && line_group.size > (em * 3)
        = render :partial => 'notices/backtrace_line', :collection => line_group[0, em], :as => :line
        = render :partial => 'notices/backtrace_line', :collection => line_group[em, line_group.size - (em * 2)], :as => :line, :locals => {:row_class => 'toggle_external_backtrace'}
        %tr
          %td.line.backtrace_separator
            %span ...
        = render :partial => 'notices/backtrace_line', :collection => line_group[em * -1, em], :as => :line

      - else
        = render :partial => "notices/backtrace_line", :collection => line_group, :as => :line
